Though 3D is now the de facto CAD standard in most engineering disciplines, 2D still has a place in industries such as technical illustration, manufacturing, and architecture. Since 3D models are the typical primary output for CAD design, users in these industries require an efficient and accurate method of generating 2D computational drawings directly from the 3D models. Hidden line removal (HLR) is an important aspect of creating an accurate 2D representation from a 3D model. Using HLR, the converted model only displays those parts visible from a given perspective; hidden (or occluded) edges normally included in a 3D model representation are removed, or drawn in a line style that indicates their obscured position. Fast, Accurate and Reliable HLR Computation 3D ACIS® PHL V5 is an HLR solution from Spatial based on CATIA V5 technology. 3D ACIS PHL V5 is an ACIS-dependent development technology - an ACIS license is required. The proven, industrial-strength CATIA V5 technology used in ACIS PHL V5 and developed by Dassault Systèmes has built its reputation for accuracy and speed through heavy use by respected engineering firms under the most demanding conditions. To add a measure of control, ACIS PHL V5 also allows users to customize the level of hidden line resolution calculations to match the accuracy required by their specific applications. The combination of performance, reliability, and precision delivered by ACIS PHL V5 make it an excellent choice for CAD, CAM, technical illustration, or any modeling or viewing application that needs to generate hidden line or planar projectable views of ACIS models.